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Quantum Matter Seminar

Monday, October 17, 2022
4:00pm to 5:00pm
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East Bridge 114
"Inhomogeneous disordering at a photoinduced charge density wave transition"
Antonio Picano, Theoretical Condensed Matter Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany,

Using ultrashort laser pulses, it has become possible to probe the dynamics of long-range order in solids on microscopic timescales. In the conventional description of symmetry-broken phases within time-dependent Ginzburg-Landau theory, the order parameter evolves coherently, with small fluctuations along an average trajectory. Recent experiments, however, indicate that some systems can support a different scenario, named ultrafast inhomogeneous disordering, where the average order parameter is no longer representative of the state on the atomic scale. Here we theoretically show that ultrafast disordering can occur in a paradigmatic model for a Peierls instability if atomic scale inhomogeneities of both the electronic structure and the charge density wave order parameter are taken into account. The latter is achieved using a non-equilibrium generalization of statistical dynamical mean-field theory, coupled to stochastic differential equations for the order parameter.

For more information, please contact Loly Ekmekjian by email at [email protected].